/* Copyright (c) 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.orkut.client.api.samples.greetings.server.servlets;

import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.orkut.client.api.samples.greetings.server.login.OrkutAuthService;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

/**
 * Handles login requests.
 *
 * @author Shishir Birmiwal
 */
@Singleton
public class LoginServlet extends HttpServlet {
  private final Provider<OrkutAuthService> orkutAuthService;

  @Inject
  public LoginServlet(Provider<OrkutAuthService> orkutAuthService) {
    this.orkutAuthService = orkutAuthService;
  }

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
    // plain /login --> a new login request
    String queryString = req.getQueryString();
    if (queryString == null || queryString.isEmpty()) {
      orkutAuthService.get().doRedirectToLogin(req, resp);
      return;
    }

    orkutAuthService.get().processLogin(req, resp);
  }
}
